<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #web_bg{
            position:fixed;
            top: 0;
            left: 0;
            width:100%;
            height:100%;
            min-width: 1000px;
            z-index:-10;
            zoom: 1;
            background-color: #fff;
            background-repeat: no-repeat;
            background-size: cover;
            -webkit-background-size: cover;
            -o-background-size: cover;
            background-position: center 0;
        }
    </style>
</head>
<body>
<img id="web_bg" th:src="@{/images/welcome.png}" alt="">
</body>
</html>